Newmont Suspends Operations at Penasquito as Strike Enters Second Week; Silver Output at Risk

June 2, 2026 — Newmont Corporation confirmed on Tuesday that operations at its Penasquito polymetallic mine in the state of Zacatecas, Mexico, remain fully suspended following the breakdown of wage negotiations with the National Union of Mine and Metal Workers, known by its Spanish acronym SNTMMSRM. The work stoppage, which began on May 26, marks the mine's first significant labour action since 2023 and threatens to remove a meaningful volume of silver and gold from global supply at a moment when both markets are already running tight inventory positions.

Penasquito is the world's largest silver-producing mine by annual output, yielding approximately 27 million ounces of silver per year alongside significant quantities of gold, lead, and zinc. At current spot prices near $76 per ounce, each week of idle production represents roughly $50 million in foregone silver output. Gold co-production at the site runs at approximately 450,000 ounces annually, adding further supply weight to the disruption. Newmont has not disclosed whether it will draw on any product stockpiles to partially offset delivery commitments during the stoppage.

Dispute Centers on Profit-Sharing and Safety Provisions

According to union representatives quoted in Mexican media on Monday, the central points of contention are the mine's profit-sharing formula — which workers argue has not been adjusted to reflect Penasquito's substantially improved margins since silver prices surged above $65 in early 2025 — and a package of safety upgrades related to deep-level ventilation that the union contends Newmont has deferred beyond agreed timelines. The company, in a statement issued Sunday, said it had made a "final, best offer" that it described as competitive with sector benchmarks and expressed willingness to resume negotiations without preconditions. Union leadership rejected the characterization, saying the proposed terms fell short of what comparable operations in the region provide.

Mexican labour law permits binding arbitration if both parties consent, but neither side has publicly indicated a willingness to pursue that avenue. State government officials in Zacatecas have offered mediation services, which the union said it would consider if Newmont first withdrew what it called punitive clauses related to productivity metrics during any future stoppage period.

Supply Implications Draw Market Attention

Analysts at Metals Focus and HSBC both flagged the stoppage in notes circulated on Monday as a potentially meaningful near-term supply disruption, particularly given the broader context of above-trend silver demand from the photovoltaic and electronics manufacturing sectors. Global silver mine supply grew only modestly in 2025, with the Silver Institute estimating output of 843 million ounces against demand of approximately 1.21 billion ounces — a structural deficit that has been met largely through above-ground inventory drawdowns and recycling flows. A prolonged halt at Penasquito would tighten that balance further.

"This is the single-largest point-source supply risk in the silver market right now," said a London-based base metals analyst who covers Newmont. "If the stoppage extends beyond three weeks, you would expect to see it reflected in lease rates and potentially in spot premiums for physical silver in the Americas."

COMEX silver futures were up 0.95 percent on Tuesday to $76.35 per ounce, and while market participants are cautious about attributing short-term price moves to a single supply factor, the Penasquito situation is being closely watched as a potential upside catalyst if negotiations remain deadlocked.

Broader Context: Labour Pressures Across the Mining Sector

The Penasquito dispute is part of a broader pattern of labour tension at precious metals operations globally. In South Africa, the National Union of Mineworkers and Solidarity are both in wage talks with major platinum group metals producers, with preliminary negotiations at Sibanye-Stillwater and Impala Platinum scheduled to conclude by the end of June. In Canada, workers at a mid-tier gold producer in northern Ontario voted last week to authorize strike action, though a deadline for formal notice has not yet been set.

Rising extraction costs, driven by energy prices and deepening ore bodies at maturing mines, have sharpened the tension between miner profitability — which has expanded considerably as metal prices have risen — and worker demands for a larger share of that surplus. Analysts note that the current environment, with gold above $4,500 and silver near multi-decade highs in real terms, gives unions a stronger bargaining position than they have held in years.

Newmont said it would provide a further operational update by the end of the week. The company's shares were down 1.4 percent in early Tuesday trading in New York.

Sarah Mitchell is Senior Markets Analyst at LiveMetalPrice.com. This article is for informational purposes only and does not constitute investment advice.